Answer:
Third choice
Step-by-step explanation:
The domain of f(x) is the set of all real values except 7, i.e
and the domain of g(x) is the set of all real values except -3, i.e
The domain of is the set of all real numbers x in the domain of
such that
is in the domain of
.
However any numbers that are excluded from the domain of f must also be excluded from the domain of .
Therefore the correct choice is all real values except x=7 and the x for which f(x) =7